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Questions and Answers

Jeep Wrangler Brake Light Stays On

Q. I have a 1993 Jeep Wrangler with a 4.0 liter 6 cylinder and a 5-speed transmission. The brake light is staying on, emergency warning light on the dash. I got under the dash and found a switch at the end of the assembly, you can see it in the attached picture, white with copper, and a loose wire, white with a black strap. I tried connecting the wire to the spade terminal but the light stays on.

Jeep Wrangler Brake Light Stays On
Jeep Wrangler Brake Light Stays On

I included a picture of the wire as well. Do you have any suggestions?

Jeep Wrangler Brake Light Stays On

Mike

A. Well, that white/black wire does go to the parking brake switch. If, when it's plugged in, the brake light stays on, you probably have a bad parking brake switch.

Jeep Wrangler Brake Light Stays On

If the brake light is on without the white/black wire plugged in, then you may have a problem with the Brake Fluid Pressure Sensor/Switch or brake hydraulic system.

The Brake Fluid Pressure Sensor/Switch activates a light on the dash panel to indicate that one of the hydraulic systems has failed. There are two basic types of switches. In some earlier models, as pressure falls in one system, the normal pressure of the other system forces the piston to the inoperative side where it contacts the switch terminal, causing the warning lights to illuminate.

On most models, the brake warning switch is of the latching type. If a pressure loss occurs in one side of the system, the piston in the valve is forced toward the failed side where it latches in position and illuminates the warning light.

The Brake Fluid Pressure Sensor/Switch is located on the left front fender panel.

Additional Information provided courtesy of AllDATA

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